Where does “hizio” come from?

hizio (Middle Breton) comes from Proto-Celtic so, from Proto-Indo-European só — this; that.

Ancestry of “hizio”, step by step

StepLanguageWordMeaning
1Proto-Celticsothis
2Proto-Indo-Europeansóthis; that
Every word from Proto-Indo-European só →Every word from Proto-Celtic so →
hizio — Etymology, Origin & Word History | Etymology Explorer